correctly count declarations after hoist_vars (#2297)

fixes #2295

lib/compress.js

@@ -3113,6 +3113,7 @@ merge(Compressor.prototype, {
                 }));
                 if (reduce_vars) name.definition().fixed = false;
             }
+            remove(def.name.definition().orig, def.name);
             return a;
         }, []);
         if (assignments.length == 0) return null;